Discussion
A person walks 5 km towards the south, turns left and walks 3 km, then turns left again and walks 5 km. How far is he from his starting point ?
Answer: B
Correct answer: 3 km
Facing south, a left turn points him east; after 3 km east, another left turn points him north. The 5 km south and 5 km north cancel, leaving 3 km east.
\[\text{Distance from start} = 3 \text{ km}\]
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